A vehicle differential lock control strategy

Abstract

The application discloses a kind of vehicle differential lock control strategies, including main drive axle wheel differential lock control strategy, second drive axle wheel differential lock control strategy, axle differential lock control strategy, main drive axle wheel differential lock control strategy: main drive axle wheel differential lock switch signal is locked when.Upper lock instruction is executed when vehicle speed is 0, and vehicle speed is not 0 Program end.Main drive axle wheel differential lock switch signal is unlocked when.Axle differential lock state signal is not locked to execute unlock instruction;Axle differential lock state signal is locked and second drive axle wheel differential lock state signal is not locked to execute unlock instruction;Axle differential lock state signal is locked and second drive axle wheel differential lock state signal is locked to end program.The application is not high to vehicle driving skill requirement, and can protect vehicle component reliability operation in real time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automotive technology, in particular to a vehicle differential lock control strategy. BACKGROUND

[0002] According to the application, in order to improve the passability and driving safety, vehicles, especially off-road vehicles, are usually equipped with differential locks. In order to ensure the safety and reliability of the vehicle, the use logic sequence between the differential locks needs a reasonable control strategy. It is understood that the current vehicle differential lock operation is mostly manual operation. In order to protect the front axle from being damaged by the transmission torque, the driver is required to operate the differential lock according to the use sequence as specified in the instruction manual. For example, the driver is required to lock the front axle differential lock after locking the rear axle differential lock, and the driver is required to unlock the rear axle differential lock after unlocking the front axle differential lock. This method has the problems of high requirement for vehicle driving skills and easy damage to vehicle parts during use. SUMMARY

[0003] The purpose of the present application is to provide a vehicle differential lock control strategy to solve the problems in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present application provides a vehicle differential lock control strategy, which comprises a main drive shaft inter-wheel differential lock control strategy, a second drive shaft inter-wheel differential lock control strategy, an inter-axle differential lock control strategy,

[0005] The main drive shaft inter-wheel differential lock control strategy is controlled by the main drive shaft inter-wheel differential lock switch signal, the inter-axle differential lock state signal, the second drive shaft inter-wheel differential lock state signal and the vehicle speed signal through logical operation. The second drive shaft inter-wheel differential lock control strategy is controlled by the second drive shaft inter-wheel differential lock state signal, the inter-axle differential lock state signal, the main drive shaft inter-wheel differential lock switch signal and the vehicle speed signal through logical operation. The inter-axle differential lock control strategy is controlled by the inter-axle differential lock state signal, the main drive shaft inter-wheel differential lock switch signal, the second drive shaft inter-wheel differential lock state signal and the vehicle speed signal through logical operation.

[0006] The general vehicle differential lock control strategy control logic algorithm is complex. The present application divides the overall differential lock control strategy of the vehicle into the control strategies of each inter-wheel and inter-axle differential, and the switch signals, state signals and vehicle speed signals required by the control strategies of each inter-wheel and inter-axle differential lock can be easily obtained.

[0007] Further, when the main drive shaft inter-wheel differential lock switch signal is unlocked and the inter-axle differential lock state signal is not locked, the main drive shaft inter-wheel differential lock receives the parameters input by the vehicle control end ECU and executes the unlocking instruction.

[0008] When the inter-axle differential lock state signal is locked and the second drive axle inter-axle differential lock state signal is unlocked, the main drive axle inter-axle differential lock receives the parameters input by the vehicle control end ECU, and executes the unlocking instruction;

[0009] When the inter-axle differential lock state signal is locked and the second drive axle inter-axle differential lock state signal is locked, the main drive axle inter-axle differential lock receives the parameters input by the vehicle control end ECU, and the program ends,

[0010] By judging the states of the inter-axle differential lock and the second drive axle inter-axle differential lock, whether the main drive axle inter-axle differential lock executes the unlocking instruction is controlled, so as to achieve the effect of preventing the vehicle power from being distributed to the second drive axle in a large proportion and causing damage.

[0011] Further, when the inter-axle differential lock switch signal is locked, the second drive axle inter-axle differential lock state signal is unlocked, and the vehicle speed is 0, the inter-axle differential lock receives the parameters input by the vehicle control end ECU, and executes the locking instruction;

[0012] When the second drive axle inter-axle differential lock state signal is unlocked and the vehicle speed is not 0, the inter-axle differential lock receives the parameters input by the vehicle control end ECU, and the program ends;

[0013] When the second drive axle inter-axle differential lock state signal is locked and the main drive axle inter-axle differential lock state signal is unlocked, the inter-axle differential lock receives the parameters input by the vehicle control end ECU, receives the parameters input by the vehicle control end ECU, and executes the unlocking instruction;

[0014] When the second drive axle inter-axle differential lock state signal is locked and the main drive axle inter-axle differential lock state signal is locked and the vehicle speed is 0, the inter-axle differential lock receives the parameters input by the vehicle control end ECU, and executes the locking instruction;

[0015] When the second drive axle inter-axle differential lock state signal is locked and the main drive axle inter-axle differential lock state signal is locked and the vehicle speed is not 0, the inter-axle differential lock receives the parameters input by the vehicle control end ECU, and the program ends;

[0016] By judging the states of the second drive axle inter-axle differential lock and the main drive axle inter-axle differential lock, whether the inter-axle differential lock executes the locking instruction is controlled, so as to achieve the effect of preventing the vehicle power from being distributed to the second drive axle in a large proportion and causing damage. By judging the vehicle speed, the inter-axle differential lock locking instruction is executed in the parking state of the vehicle, so as to achieve the effect of preventing damage when the inter-axle differential lock is locked.

[0017] Further, when the second drive axle inter-axle differential lock switch signal is locked, the inter-axle differential lock state signal is unlocked, and the vehicle speed is 0, the second drive axle inter-axle differential lock receives the parameters input by the vehicle control end ECU, and executes the locking instruction;

[0018] When the inter-axle differential lock state signal is unlocked and the vehicle speed is not 0, the second drive axle inter-axle differential lock receives the parameters input by the vehicle control end ECU, and the program ends;

[0019] When the inter-axle differential lock state signal is locked and the main drive axle inter-axle differential lock state signal is unlocked, the second drive axle inter-axle differential lock receives the parameters input by the vehicle control end ECU, and executes the unlocking instruction;

[0020] When the inter-axle differential lock state signal is locked and the main drive axle inter-axle differential lock state signal is locked and the vehicle speed is 0, the second drive axle inter-axle differential lock receives the parameters input by the vehicle control end ECU, and executes the locking instruction;

[0021] When the inter-axle differential lock state signal is locked and the main drive axle inter-axle differential lock state signal is locked and the vehicle speed is not 0, the second drive axle inter-axle differential lock receives the parameters input by the vehicle control end ECU, and the program ends,

[0022] By judging the states of the inter-axle differential lock, the main drive axle inter-axle differential lock and the second drive axle inter-axle differential lock, whether the second drive axle inter-axle differential lock executes the locking instruction is controlled, so that the effect of preventing the vehicle power from being distributed to the second drive axle to cause damage is achieved. By judging the vehicle speed, the second drive axle inter-axle differential lock locking instruction is executed in the vehicle parking state, so that the effect of preventing the second drive axle inter-axle differential lock from being damaged is achieved.

[0023] Further, the main drive axle inter-axle differential lock, the second drive axle inter-axle differential lock and the inter-axle differential lock include the following combinations: 1) the main drive axle inter-axle differential lock is unlocked, the second drive axle inter-axle differential lock is unlocked and the inter-axle differential lock is unlocked; 2) the main drive axle inter-axle differential lock is locked, the second drive axle inter-axle differential lock is unlocked and the inter-axle differential lock is unlocked; 3) the main drive axle inter-axle differential lock is unlocked, the second drive axle inter-axle differential lock is unlocked and the inter-axle differential lock is locked; 4) the main drive axle inter-axle differential lock is locked, the second drive axle inter-axle differential lock is unlocked and the inter-axle differential lock is locked; 5) the main drive axle inter-axle differential lock is unlocked, the second drive axle inter-axle differential lock is locked and the inter-axle differential lock is unlocked; 6) the main drive axle inter-axle differential lock is locked, the second drive axle inter-axle differential lock is locked and the inter-axle differential lock is unlocked; 7) the main drive axle inter-axle differential lock is unlocked, the second drive axle inter-axle differential lock is locked and the inter-axle differential lock is locked; and 8) the main drive axle inter-axle differential lock is locked, the second drive axle inter-axle differential lock is locked and the inter-axle differential lock is locked.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The reasonable control strategy of the present application can reduce the driving requirements of the driver, protect the vehicle parts, improve the safety and reliability of the vehicle, and protect the reliable operation of the vehicle parts in real time. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The axle differential lock control strategy flow chart for the vehicle differential lock control strategy of the present application is a main drive axle wheel differential lock control strategy flow chart.

[0027] Figure 2 The axle differential lock control strategy flow chart for the vehicle differential lock control strategy of the present application is an axle differential lock control strategy flow chart.

[0028] Figure 3 The axle differential lock control strategy flow chart for the vehicle differential lock control strategy of the present application is a second drive axle wheel differential lock control strategy flow chart.

[0029] Figure 4 The real vehicle diagram in the embodiment of the vehicle differential lock control strategy.

[0030] In the figure: 1-main drive axle wheel differential lock and differential lock signal, 2-axle differential lock and differential lock signal, 3-vehicle differential lock controller (including calibration program), 4-main drive axle wheel differential lock switch, 5-axle differential lock switch, 6-second drive axle wheel differential lock switch, 7-second drive axle wheel differential lock and differential lock signal. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below. If the specific conditions are not specified in the embodiments, the conventional conditions or the conditions recommended by the manufacturer are adopted. If the reagents or instruments used are not specified by the manufacturer, they are all conventional products that can be purchased on the market.

[0032] Embodiment:

[0033] The vehicle differential lock control strategy provided in this embodiment is: the system composition is seen from Figure 4 , which includes main drive axle wheel differential lock and differential lock signal 1, axle differential lock and differential lock signal 2, vehicle differential lock controller (including calibration program) 3, main drive axle wheel differential lock switch 4, axle differential lock switch 5, second drive axle wheel differential lock switch 6, and second drive axle wheel differential lock and differential lock signal 7. The calibration program block diagram is seen from Figures 1-3 .

[0034] The vehicle differential lock controller (including calibration program) 3 includes main drive axle wheel differential lock control strategy, second drive axle wheel differential lock control strategy, and axle differential lock control strategy.

[0035] The main drive axle inter-wheel differential lock control strategy is implemented by the vehicle differential lock controller (including calibration program) 3 based on the status of the main drive axle inter-wheel differential lock switch 4, the inter-axle differential lock and differential lock signal 2, the second drive axle inter-wheel differential lock and differential lock signal 7, and the vehicle speed signal (provided by the vehicle differential lock controller (including calibration program) 3). Figure 1 (As shown) The program controls the differential lock between the main drive shaft wheels and the differential lock signal 1.

[0036] The second drive axle inter-wheel differential lock control strategy is implemented by the vehicle differential lock controller (including calibration program) 3 based on the status of the second drive axle inter-wheel differential lock switch 6, the inter-axle differential lock and differential lock signal 2, the main drive axle inter-wheel differential lock and differential lock signal 1, and the vehicle speed signal (provided by the vehicle differential lock controller (including calibration program) 3). Figure 3 (As shown) The program controls the differential lock between the wheels of the second drive shaft and the differential lock signal 7.

[0037] The inter-axle differential lock control strategy is implemented by the vehicle differential lock controller (including calibration program) 3 based on the status of the inter-axle differential lock switch 5, the differential lock and differential lock signal 1 between the main drive axle wheels, the differential lock and differential lock signal 7 between the second drive axle wheels, and the vehicle speed signal (provided by the vehicle differential lock controller (including calibration program) 3). Figure 2 (As shown) The program controls the inter-shaft differential lock and differential lock signal 2.

[0038] Main drive shaft differential lock control strategy Figure 1 (As shown): When the main drive axle inter-wheel differential lock switch 4 is locked, the vehicle speed is 0, and the locking command is executed; if the vehicle speed is not 0, the program ends. When the main drive axle inter-wheel differential lock switch 4 is unlocked, the inter-axle differential lock and differential lock signal 2 are unlocked, and the unlocking command is executed; when the inter-axle differential lock and differential lock signal 2 are locked and the second drive axle inter-wheel differential lock and differential lock signal 7 are unlocked, the unlocking command is executed; when the inter-axle differential lock and differential lock signal 2 are locked and the second drive axle inter-wheel differential lock and differential lock signal 7 are locked, the program ends.

[0039] Inter-axle differential lock control strategy Figure 2When the inter-axle differential lock switch 5 is unlocked, the unlocking instruction is executed. When the inter-axle differential lock switch 5 is locked, the locking instruction is executed when the second drive axle wheel differential lock and differential lock signal 7 is unlocked and the vehicle speed is 0; the program ends when the second drive axle wheel differential lock and differential lock signal 7 is unlocked and the vehicle speed is not 0; the unlocking instruction is executed when the second drive axle wheel differential lock and differential lock signal 7 is locked and the main drive axle wheel differential lock and differential lock signal 1 is unlocked; the locking instruction is executed when the second drive axle wheel differential lock and differential lock signal 7 is locked, the main drive axle wheel differential lock and differential lock signal 1 is locked, and the vehicle speed is 0; and the program ends when the second drive axle wheel differential lock and differential lock signal 7 is locked, the main drive axle wheel differential lock and differential lock signal 1 is locked, and the vehicle speed is not 0.

[0040] Second drive axle wheel differential lock control strategy Figure 3 When the second drive axle wheel differential lock switch 6 is unlocked, the unlocking instruction is executed. When the second drive axle wheel differential lock switch 6 is locked, the locking instruction is executed when the inter-axle differential lock and differential lock signal 2 is unlocked and the vehicle speed is 0; the program ends when the inter-axle differential lock and differential lock signal 2 is unlocked and the vehicle speed is not 0; the unlocking instruction is executed when the inter-axle differential lock and differential lock signal 2 is locked and the main drive axle wheel differential lock and differential lock signal 1 is unlocked; the locking instruction is executed when the inter-axle differential lock and differential lock signal 2 is locked, the main drive axle wheel differential lock and differential lock signal 1 is locked, and the vehicle speed is 0; and the program ends when the inter-axle differential lock and differential lock signal 2 is locked, the main drive axle wheel differential lock and differential lock signal 1 is locked, and the vehicle speed is not 0.

[0041] There are eight differential lock state combinations in a vehicle differential lock control strategy controlled by the vehicle differential lock controller (including calibration program) 3, which are: 1, the main drive shaft wheel differential lock and the differential lock signal 1 are not locked, the second drive shaft wheel differential lock and the differential lock signal 7 are not locked, the inter-axle differential lock and the differential lock signal 2 are not locked; 2, the main drive shaft wheel differential lock and the differential lock signal 1 are locked, the second drive shaft wheel differential lock and the differential lock signal 7 are not locked, the inter-axle differential lock and the differential lock signal 2 are not locked; 3, the main drive shaft wheel differential lock and the differential lock signal 1 are not locked, the second drive shaft wheel differential lock and the differential lock signal 7 are not locked, the inter-axle differential lock and the differential lock signal 2 are locked; 4, the main drive shaft wheel differential lock and the differential lock signal 1 are locked, the second drive shaft wheel differential lock and the differential lock signal 7 are not locked, the inter-axle differential lock and the differential lock signal 2 are locked; 5, the main drive shaft wheel differential lock and the differential lock signal 1 are not locked, the second drive shaft wheel differential lock and the differential lock signal 7 are locked, the inter-axle differential lock and the differential lock signal 2 are not locked; 6, the main drive shaft wheel differential lock and the differential lock signal 1 are locked, the second drive shaft wheel differential lock and the differential lock signal 7 are locked, the inter-axle differential lock and the differential lock signal 2 are not locked; 7, the main drive shaft wheel differential lock and the differential lock signal 1 are not locked, the second drive shaft wheel differential lock and the differential lock signal 7 are locked, the inter-axle differential lock and the differential lock signal 2 are locked; 8, the main drive shaft wheel differential lock and the differential lock signal 1 are locked, the second drive shaft wheel differential lock and the differential lock signal 7 are locked, the inter-axle differential lock and the differential lock signal 2 are locked. The vehicle differential lock controller (including calibration program) 3 prohibits the seventh differential lock state combination, and allows the other differential lock state combinations to exist.

[0042] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit and essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the above description, and it is intended to embrace all changes and modifications that fall within the meaning and range of equivalents of the claims, and no reference signs in the claims should be considered as limiting the claims to which they belong.

[0043] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A vehicle differential lock control strategy, characterized in that: This includes differential lock control strategies for the main drive axle, the second drive axle, and the inter-axle differential lock control strategies. The main drive axle inter-wheel differential lock control strategy uses logical operations to control the main drive axle inter-wheel differential lock state through the main drive axle inter-wheel differential lock switch signal, inter-axle differential lock state signal, second drive axle inter-wheel differential lock state signal, and vehicle speed signal. The second drive axle inter-wheel differential lock control strategy uses logical operations to control the second drive axle inter-wheel differential lock state through the second drive axle inter-wheel differential lock state switch signal, inter-axle differential lock state signal, main drive axle inter-wheel differential lock switch state signal, and vehicle speed signal. The inter-axle differential lock control strategy uses logical operations to control the inter-axle differential lock state through the inter-axle differential lock state signal, main drive axle inter-wheel differential lock switch signal, second drive axle inter-wheel differential lock state signal, and vehicle speed signal.

2. The vehicle differential lock control strategy according to claim 1, a differential lock control strategy between the main drive axle wheels, characterized in that, Its main drive axle differential lock control strategy is as follows: When the differential lock switch signal between the main drive shaft wheels is unlocked, and the differential lock status signal between the shafts is unlocked... The differential lock between the main drive shaft wheels executes the unlocking command; When the inter-axle differential lock status signal is locked, and the second drive axle inter-wheel differential lock status signal is unlocked, The differential lock between the main drive shaft wheels executes the unlocking command; When the inter-axle differential lock status signal is locked and the second drive axle inter-wheel differential lock status signal is locked, the main drive axle inter-wheel differential lock control program ends.

3. The vehicle differential lock control strategy according to claim 1, characterized in that, Its inter-axle differential lock control strategy is as follows: When the inter-axle differential lock switch signal is locked, the inter-axle differential lock status signal is unlocked, and when the vehicle speed is 0, the inter-axle differential lock control executes the locking command; When the differential lock status signal between the second drive axle wheels is unlocked and the vehicle speed is not 0, the differential lock control program ends. When the differential lock status signal between the second drive axle wheels is locked, and the differential lock status signal between the main drive axle wheels is unlocked, The inter-axle differential lock executes the unlock command; The differential lock status signal between the second drive axle wheels is locked, the differential lock status signal between the main drive axle wheels is locked, and the differential lock between the axles executes the locking command when the vehicle speed is 0. When the differential lock status signal between the second drive axle wheels is locked, the differential lock status signal between the main drive axle wheels is locked, and the vehicle speed is not 0, the inter-axle differential lock control program ends.

4. The vehicle differential lock control strategy according to claim 1, the second drive axle wheel differential lock control strategy, is characterized in that, Its second drive axle inter-wheel differential lock control strategy is as follows: When the second drive axle inter-wheel differential lock switch signal is locked, the inter-axle differential lock status signal is unlocked, and when the vehicle speed is 0, the second drive axle inter-wheel differential lock executes the locking command. When the inter-axle differential lock status signal is unlocked and the vehicle speed is not 0, the inter-axle differential lock procedure of the second drive axle ends. When the inter-axle differential lock status signal is locked and the main drive axle inter-wheel differential lock status signal is unlocked, the second drive axle inter-wheel differential lock executes the unlocking command; When the inter-axle differential lock status signal is locked, the main drive axle inter-wheel differential lock status signal is locked, and the vehicle speed is 0, the second drive axle inter-wheel differential lock executes the locking command. When the inter-axle differential lock status signal is locked, the inter-drive axle differential lock status signal is locked, and the vehicle speed is not 0, the inter-drive axle differential lock control program ends.

5. The vehicle differential lock control strategy according to claim 1, characterized in that: The main drive axle inter-wheel differential lock, the second drive axle inter-wheel differential lock, and the inter-axle differential lock include the following combinations: 1) Main drive axle inter-wheel differential lock not engaged, second drive axle inter-wheel differential lock not engaged, and inter-axle differential lock not engaged; 2) Main drive axle inter-wheel differential lock engaged, second drive axle inter-wheel differential lock not engaged, and inter-axle differential lock not engaged; 3) Main drive axle inter-wheel differential lock not engaged, second drive axle inter-wheel differential lock not engaged. 4) Inter-axle differential lock locked; second drive axle inter-axle differential lock unlocked; inter-axle differential lock locked; 5) Inter-axle differential lock unlocked; second drive axle inter-axle differential lock locked; inter-axle differential lock unlocked; 6) Inter-axle differential lock locked; second drive axle inter-axle differential lock locked; inter-axle differential lock unlocked; 7) Inter-axle differential lock unlocked; second drive axle inter-axle differential lock locked; inter-axle differential lock locked; 8) Inter-axle differential lock locked; second drive axle inter-axle differential lock locked; inter-axle differential lock locked.

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